I think end of May. Not complete end, just starting to relax things. In terms of order in which things reopen:
Shops first would be my guess, as they can be controlled somewhat. Like the supermarkets are doing, they can limit how many can come in, they can make the floor. That will get a significant portion of people back into work and people will start spending money.
Open air spaces also one of the first, so beaches, parks etc.
Second, Controlled in terms of people, but services like opticians, hairdressers, nail places, beauty salons etc next. Again controlled, this can be done by appointments at most places.
Then leisure centres, swimming pools etc. Again, limiting capacity (which they already do but tightening it a bit more)
Lastly - restaurants, pubs, cinemas - where distancing is probably the hardest.
Holiday parks, tourist attractions, the ability to go on holiday.....I have no idea. It’s all guess work